Mixing apparatus



Nov. 16 ,1926. 1,607,404

v A. M. Low

MIXING APPARATUS 2 Sheets-Sheet l Filed Jan. 24. 1925 Nov. 16 1926.

A. M. LOW

MIXING APPARATUS Filed Jan. 24, 1925 2 sheds-sheer 2A l Patented Nov. 16, `1926.

UNITED STATES PATENT orti-ce.

ARCHIBALD MONTGOMERY LOW, OF LONDON, ENGLAND, ASSItrloli.` TOy THE LOW ENGINEERING COMPANY LIMITED, OF LONBON, E1\T(;`rI.|AND.`

Y Mixine APPARATUS.

Application led January 24, 1925, Serial No. 4,479, and in Great Britain February 1, 1924.

This invention relates to mixing appaatus more particularly of the type described in United States Letters Patent No. 1,475,- 638 in which there is embodied a stationary casing containing` two relatively movable drums or rotors provided With interengaging beaters (Jo-operating Without contact, the axes of Vsaid drums being so relatively displaced that the inner drum lies Within the periphery of the outer drum to one side of its centre.

One feature of the present invention consists in the provision of an additional drum or rotor mounted coaxially With and rotatable With the outer drum, said addi-tional drum having peripheral beaters which interengage Without contact with the beaters of the inner axially displaced drum above referred to. The provision of the additional drum or rotor isfor the purpose of improving the mixture of the materials under treatnient and admixture and homogeneous emulsion.

A further feature of the invention is an improved form of ieater for any roll or all of the drums in question, these being spaced around the drums at any required intervals, for instance such as Will permit one drum to be readily Withdrawn' axiallyV from another and each comprising a substantially straight forward radial edge, which may be slightly curved Where it joins the Vhub of the drum and a backl edge comprising'astraight part leading bya `curved part to the rim and to a straight apex or a back edgecontinuous- These forms of ly and reversibly curved. beater have the advantage that the substance under treatment after striking the straight radial edge will flow up to the apex, follovT around the curved back of the beater Vand strike the radial edge of the next beater, thus rendering every beater effective instead ofthe substance flowing tangentially along the straight topv as Woul'doccur ivith an or.- dinary rectangular beater, possibly missing the adjacent beater and not falling over and striking the radial edge of the next beater to the full extent. The form of beater described also facilitates manufacture as it permits of ready casting and may dispense with machining, of cost.

A n example of a simple form of hand operated mixing mill embodying the present improvementsV is illustrated in the accomresults Vin a much more intimate thus resulting in reduction' panying drawings in which Fig. l is a side elevation With casing removed; Fig. 2 is a vertical cross section and Fig. 3, a plan vien' Withv part of the casing broken away.

The outer circular casing a mayV consist of a casting` and has a dividing partition 'Wall al on one side of which are disposed the drums and on the other side the driving mechanism,

The said drums comprising` the following, viz, an outer main drumb having interiorly directed spaced beaters 7)] and open at one side; at the other side are spokes b2 formed 4integrally with a boss o to receive a driving spindle b4. On the said spindle is also mounted the additional drum chaving exterior spaced beaters c1 which engageV between thev exterior beaters C51 of the axially displaced drum (l the latter beinginounted on a spindle Z2 and the beatersy ofrv'hich in turn engage between the interior beaters '51 of the main drum ZJ.

'The shape of said beaters is clearly shown in Fig. l inthe case of the outer drum having` the straight forward radial edge 02 and a straight portion e .leading by a curved part to the rim and tothe apex which isstraight, and in the case of the inner drums, the said back edge is continuously and reversely curved as at 7/. The forward edges of the beaters may be chamfcred at the side or sides as at. m1. 1

The inlet for the materials to be treated comprises a `hopper e or the like disch,arginer` above laterally throughthe partition Wall a] to the drum compartment and the outlet is shown in theforin of faucet f having` a controlling` coctlo in the opposite uiall f1 of said compartment Whichvwvall', When closed, is removably securedto ythe casing as by means of the clamp f2, having bent ends f3 engagingbehind a flange ft, of the casing and a screav` f5 passing through athreaded hole in the clamp and bearing in a socket f6 formed on lthe exterior of the Wall. The spindles b4 and (Z2 of theA outer and inner drums pass through bushes 725 and Z3 inthe partition al and the spindle b4 hasmounted thereon a v,Q fear Wheel r/ meshing Wit-h a pinion g1 of the spindle d?. There isalso a pinion g2 on the spindle b4 which in turn meshes with a gear Wheel (/3 on a counterspindle g4 extending from the partition and carrying an operating crank or handleV 7L for its rotation. By this means a very ile;-

high rotational speed can be given to the drums to produce an intimate mixture of the n'iaterials, but obviously, the apparatus may be driven by power with or without auf.rv intermediate gearing.

The pinions and gear wheels are secured on their respective spindles by nuts z' screwed into reduced threaded ends ot said spindles and by unscrewing said nuts on one hand :ind removing the wall. ,tl on the other hand the drunis. gearing and spindles may all be readily removeri trom the easing tor cleaning or other purposes.

lVliat l claim as my invention and desire 'to secure by Letters Patent ot the llnitid States is A l. mixings apparatus eoinprisinp` a stationary Casing, two coaxial rotatable druins one within the other and provided with interior and exterior beaters respectively, the beaters ot each drinn being spaced longitudinally with respect to the axis ot rotation of the drums, and a third drinn rotat-y able relatively to the iirst mentioned drums and having beaters interengaging without contact with the beaters ot said tirst ment-ioned drums.

2. A mixing apparatus comprising a sta" tionary casing, two coaxial rotatable drinns mounted in said casing one within the other and provided with interior and exterior' radially disposed beaters respectively, and a third drinn rotatable relatively7 to the tirst n'ientionei'l drums and having` exterior radially disposed beaters cooperating with the beaters of the first mentioned drumsa the beaters ot each drinn being arranged in annular series spaced apart longit-udinall;v ot the axis ot rotation ot the related drum.

3. A mixingapparat-ns comprising a stationary casing. a rotatable drinn having interior beaters` a seroud drum within the irst drum coaxial with the latter and having exterior beaters, and a third drum within the first drum having exterior beaters cooperating` with the beaters of the rst and second drums the beaters of all the drums being ot such relative width and annular spacem-ent that those of the second drinn can be withdrawn longitudinally through the beaters of the third drum and the beaters of the latter withdrawn longitudinally through the beaters of the first and second drums.

4i. A mixing apparatus comprising a stationary Casingq two coaxial rotatable drums one Within the other and provided with interior and exterior beaters respectively, the beaters of each drum being spaced longitudinally with respect to the axis ot rotation ol' the drums, a third drinn rotatable relatively7 to the first mentioned drums and having beaters interengaging without eontact with the beaters ot said first mentioned drums, the beaters ot the severa drums being correspondinglv formed with each beater having a straight forward radial edge and a back edge comprising a straight-part leading by a curifed part to the rini and to the apex which is straight.

5. .mixing apparatus comprising a stationarjv casing, two coaxial rotatable drinns one within the other and provided with interior and exterior beaters respectively, the beaters ot each drum being' spaced longitudinally with respect to the axisotI rotation ot the drums7 a third drum rotatable relatively to the irst mentioned drums and having beaters interengaging vithoiit contact with the beaters oitl said first mentioned drums, the beaters ot the several driuns being correspondingly termed with each beater having a straight forward radial edge and a bach edge continuously and reve sely curved.

G. A mixing apparatus Comprising in combination an outer casing tor receiving the materials to be mixed, a drum mounted Y tor rotation within said casing with its outer periphery closely adjacent the inner wall of the casing and adapted to carry around the material in the casing, beaters arranged on the interior periphery ot said drum. a Vseeond drum disposed within the periphery ot the outer drinn and having exterior beaters interengaging those ot the inner drinn, and a third drum mounted coaxially with the first drinn and having peripheral heaters adapted to engage the peripheral beaters of the second drum.

7. mixing apparatus comprising in combination an outer casing for receiving the materials to be mixed, a drum mounted for rotation within said easing with its outer periphery closely adjacent the inner wall ot the casing and adapted to carry around the material in the Casing, beaters arranged in the interior periphery of said drumr a seeond drinn disposed within the periphery ot' the outer drum and having exterior beaters interengaging those ot' the inner drum, a third drum mounted coaxially with the iirst drinn and having peripheral beaters adapted to engage the peripheral beaters of the second drum, and a gearing device disposed exteriorly ot the casing tor operating the drums.

ln witness whereot l have signed this specilication. v

ARCHIBALD MUNTGOh/[ERY LOW. 

